Hi Everyone,

I had some questions about the calculated brightness temperature in ARTS.

When I calculate the brightness temperature for an atmospheric scenario in 
"horizon looking mode" and in clearsky. I get a brightness temperature at 
183.31 GHz (Water vapor absorption line), which is about 3 to 6 degrees lower 
than the ambient temperature.

I would assume that at the water vapor absorption line and at low altitudes (~2 
km above sea level), I should measure very close to the ambient temperature 
(Due to high absorption).

So, my questions are:

1.)  Is this brightness temperature bias expected?, or can something else cause 

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